Machine Over Matter {1}{U}
Instant
This spell costs {1} less to cast if you control an artifact creature.
Return target nonland permanent to its owner's hand.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Assassin's Ink 86%
$0.25#15287
"This spell costs {1} less to cast if you control an artifact and {1} less to cast if you control an enchantment."
Stoic Rebuttal 86%
$0.30#6572
"This spell costs {1} less to cast if you control three or more artifacts."
Chitin Gravestalker 85%
$0.20#13313
"This spell costs {1} less to cast for each artifact and/or creature card in your graveyard."
Cavern-Hoard Dragon 82%
$14.28#1475
"This spell costs {X} less to cast, where X is the greatest number of artifacts an opponent controls."
Metalwork Colossus 80%
$0.31#1718
"This spell costs {X} less to cast, where X is the total mana value of noncreature artifacts you control."
Artificer Class 80%
$15.06#4038
"The first artifact spell you cast each turn costs {1} less to cast."